/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.usergrid.security.crypto.command;


import java.util.UUID;

import org.apache.usergrid.persistence.CredentialsInfo;


/**
 * Simple chain of responsibility algorithm for password cryptography.
 *
 * @author tnine
 */
public abstract class EncryptionCommand {

    /** The default implementations provided by subclasses */
    public static final String SHA1 = "sha-1";
    public static final String MD5 = "md5";
    public static final String PLAINTEXT = "plaintext";
    public static final String BCRYPT = "bcrypt";


    /**
     * Perform the required hash on the input bytes, using the CredentialsInfo and the user provided.  Subclasses should
     * invoke the next in the chain if required.
     */
    public abstract byte[] hash( byte[] input, CredentialsInfo info, UUID userId, UUID applicationId );

    /** Perform authentication from the given input bytes.  Return the bytes that should be used for comparison */
    public abstract byte[] auth( byte[] input, CredentialsInfo info, UUID userId, UUID applicationId );

    /** Get the name of this encryption command */
    public abstract String getName();
}
